This paper presents a heuristic method that efficiently approximates the optimum number of spares predicted by yield models through figures of merit. This method, which is based on simple approximate functions, offers...
This paper presents a heuristic method that efficiently approximates the optimum number of spares predicted by yield models through figures of merit. This method, which is based on simple approximate functions, offers a very good trade-off between CPU time and accuracy. Indeed, the CPU time required is negligible compared to what is needed for a direct prediction of the optimum number of spares using yield models and figures of merit. Also, the approximations provided by the proposed heuristic method are very close to the exact values predicted by yield models over a wide range of parameters. A hybrid prediction method, that makes it possible to accelerate the prediction of the optimum amount of redundancy without precision losses, is also presented. This hybrid method, which uses results from the heuristic method as starting points around which yield models and figures of merit are applied, is almost optimum in terms of CPU time over the parameter range considered.
To date, many models have been developed to predict the yield of defect-tolerant integrated circuits (ICs). In this paper, results obtained from several of these models are compared. Their sensitivity to various model...
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To date, many models have been developed to predict the yield of defect-tolerant integrated circuits (ICs). In this paper, results obtained from several of these models are compared. Their sensitivity to various model parameters is also examined. These results lead one to conclude that, despite differences in the predicted amount of redundancy, it may be possible to obtain good solutions. The differences in the solutions come from the models as well as from the parameters used in these models, and solutions are said to be good when the resulting figures of merit are rather insensitive. Consequently, a simple method is proposed to select the number of spares to add in defect-tolerant ICs.< >
The design of multilayer directional couplers with septum is often done using the spectral domain technique. This technique consists in taking the Fourier transform of the boundary conditions and then expressing the c...
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The design of multilayer directional couplers with septum is often done using the spectral domain technique. This technique consists in taking the Fourier transform of the boundary conditions and then expressing the charge distribution on the conductor, ρ i and the septum, ρ s as a function of G ij , the Green function . Galerkin optimization technique is then used to compute ρ i and ρ s as a summation of arbitrary chosen basis functions, e.g., equation A proper choice of basis functions determines the precision and convergence of results.
The authors have laid the foundations for a functional test generation procedure based on a cyclomatic complexity measure (CCM) and on the reduced, ordered binary decision diagram representation (ROBDD) for Boolean fu...
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The authors have laid the foundations for a functional test generation procedure based on a cyclomatic complexity measure (CCM) and on the reduced, ordered binary decision diagram representation (ROBDD) for Boolean function manipulation. The CCM has been defined for one-output and multi-output electronic circuits predicting a minimal number of test vectors. This new test generation approach, called Cyclogen, has been implemented, and the tests for several functional primitives as well as for the ISCAS-85 benchmark circuits have been generated successfully. The results show that this approach is effective and promising.< >
In Malhamé and Boukas (1991), we have shown that the transient statistical evolution of a single production manufacturing system under hedging control policies is characterized by a system of coupled partial diff...
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In Malhamé and Boukas (1991), we have shown that the transient statistical evolution of a single production manufacturing system under hedging control policies is characterized by a system of coupled partial differential equations. By exploiting the renewal structure of the controlled process, we have also derived statistical bounds on the speed of convergence to steady state. In this paper, we deal with the following questions: How does the theoretical bound in Malhamé and Boukas (1991) on the speed of convergence to steady state compare with the one obtained by numerically solving the coupled partial differential equations? Under which condition the transient regime must be considered, i.e. how short should the control horizon be that steady state based controllers start performing poorly? How are the values of a best hedging level policy affected by the length of the optimization interval?
The authors present an investigation of methods for land mobile radio (LMR) channel loading in voice dispatch systems. Queuing models for trunked LMR dispatch systems are reviewed. A decomposition approach is proposed...
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The authors present an investigation of methods for land mobile radio (LMR) channel loading in voice dispatch systems. Queuing models for trunked LMR dispatch systems are reviewed. A decomposition approach is proposed. The decomposed models take into account waiting times both at the system level and at the fleet level, as well as the traffic characteristics of many practical situations, within a consistent methodological framework. Model validation is presented, and some desiderata for monitoring these systems are formulated.< >
An adaptive motion control scheme for robotic manipulators is presented. This is an adaptive computed torque method (CTM) that requires only position measurements. These measurements and the input torques are used in ...
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An adaptive motion control scheme for robotic manipulators is presented. This is an adaptive computed torque method (CTM) that requires only position measurements. These measurements and the input torques are used in an extended Kalman filter (EKF) to estimate the inertial parameter of the full nonlinear robot model as well as the joint positions and velocities. These estimates are used by the CTM to generate the input torques. This combination of the EKF and the CTM was shown to result in a stable adaptive control scheme. Experimental results with a two-degree-of-freedom direct-drive robot illustrate the performance of this scheme.< >
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